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Enhanced wireless access technologies and experiments for W-CDMA communications

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4 Author(s)
Sawahashi, M. ; NTT DoCoMo Inc., Japan ; Higuchi, K. ; Tanaka, S. ; Adachi, F.

This article reviews enhanced wireless access technologies and experimental evaluations of the wideband DS-CDMA physical layer employing intercell asynchronous operation with a three-step fast cell search method, pilot symbol-assisted coherent links, signal-to-interference plus background noise power ratio-based fast transmit power control, site diversity (soft/softer handover), and transmit diversity in the forward link. The article also presents link-capacity-enhancing techniques such as using an interference canceller and adaptive antenna array diversity receiver/transmitter, and experimental results in a real multipath fading channel. The laboratory and field experiments exemplify superior techniques of the W-CDMA physical layer and the potential of the IC and AAAD transceiver to decrease the mobile transmit power in the reverse link and multipath interference from high-rate users with large transmit power in the forward link

Published in:

Personal Communications, IEEE  (Volume:7 ,  Issue: 6 )